pure tungsten rod 

 

Type	purity	application of tungsten bar
W1	>=99.95%	filament,cathode and components for electron tubes,electrode for the gas discharge tube.etc.
W2
W3	>=99.7%	grid siderod,lead,support,electrode for the discharge lamp,etc.
W4	>=99.%	grid siderod,support,lead and electrode,etc.

GRADE		W1	W2	W3	W4
Purity (%) min.	W	99.95	99.95	99.70	99.00
IMPURITY  (ppm) max.	Fe	50	50	100	500
	Ni	30	30	50	3000
	Al	20	20	50	50
	Si	30	30	100	100
	Ca	30	30	50	50
	Mg	20	20	50	100
	Mo	100	100	2000	2000
	P	10	10	20	50
	C	50	80	100	100
	O	30	30	50	80
	N	30	30	---	---
	Pb	1	1	1	10
	Bi	1	1	1	10
	Sn	3	3	3	10
	Sb	10	10	10	10
	As	20	20	20	20

 

tungsten content	Type	Diameter (mm)	Dia. tolerance (mm)	Length9 (mm)	L tolerance (mm)	Liner rate
99.95%	Sintering Rod	Φ40-100	±3	<500	±5	±5%
	Forged Rod	Φ20-80	±2	<800	±5	±2%
	Ground Rod	Φ2-60	±0.1	<650	±1	±0.5%
Application	Be used for drawing tungsten wires, electrodes, heaters in high temperature vacuum furnace and so on.

 

Production PROCESS 

 

Tungsten Podwer → Isostatic Pressing → Bar Billet →Sinering  → Semi-finished bar  →Forging→ Swaging → Polished → End products → Inspection  → Packing

 

Application:Tungsten bar is mainly used to found ingredient of material, cutter and heads, tungsten wire for lights instruments and conductor of heat, crankshaft and cylinder barrel of advanced automobile, ingredient of kinds of heat-resistant steel. These products are mainly used for making finished tungsten wire, rods and plates and additives for precision alloy.